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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96c09741a28cdb7244f289e721d1bc9456dd589be3b8f7ffbb49057bb54d3de' 
  AND token = 'ZIW42H4wkML7FOHTejpMLcMCSzEa39Tzi6wD2VODk+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}